Add //mojo/edk/platform and move platform_task_runners.h there.

mojo/edk/embedder/embedder.cc

Index: mojo/edk/embedder/embedder.cc
diff --git a/mojo/edk/embedder/embedder.cc b/mojo/edk/embedder/embedder.cc
index fa90bc48f2759aafc1b8fe2508117bda85133aeb..74b38ddd9d7a1c9024726ae80cda46a8e00fc2a5 100644
--- a/mojo/edk/embedder/embedder.cc
+++ b/mojo/edk/embedder/embedder.cc
@@ -25,6 +25,7 @@
 #include "mojo/edk/system/raw_channel.h"
 #include "mojo/edk/util/ref_ptr.h"
 
+using mojo::platform::TaskRunner;
 using mojo::util::RefPtr;
 
 namespace mojo {
@@ -65,7 +66,7 @@ system::ChannelId MakeChannelId() {
 // Note: Called on the I/O thread.
 void ShutdownIPCSupportHelper() {
   // Save these before they get nuked by |ShutdownChannelOnIOThread()|.
-  RefPtr<PlatformTaskRunner> delegate_thread_task_runner(
+  RefPtr<TaskRunner> delegate_thread_task_runner(
       internal::g_ipc_support->delegate_thread_task_runner());
   ProcessDelegate* process_delegate =
       internal::g_ipc_support->process_delegate();
@@ -139,9 +140,9 @@ MojoResult PassWrappedPlatformHandle(MojoHandle platform_handle_wrapper_handle,
 }
 
 void InitIPCSupport(ProcessType process_type,
-                    RefPtr<PlatformTaskRunner>&& delegate_thread_task_runner,
+                    RefPtr<TaskRunner>&& delegate_thread_task_runner,
                     ProcessDelegate* process_delegate,
-                    RefPtr<PlatformTaskRunner>&& io_thread_task_runner,
+                    RefPtr<TaskRunner>&& io_thread_task_runner,
                     ScopedPlatformHandle platform_handle) {
   // |Init()| must have already been called.
   DCHECK(internal::g_core);
@@ -173,7 +174,7 @@ ScopedMessagePipeHandle ConnectToSlave(
     SlaveInfo slave_info,
     ScopedPlatformHandle platform_handle,
     const base::Closure& did_connect_to_slave_callback,
-    RefPtr<PlatformTaskRunner>&& did_connect_to_slave_runner,
+    RefPtr<TaskRunner>&& did_connect_to_slave_runner,
     std::string* platform_connection_id,
     ChannelInfo** channel_info) {
   DCHECK(platform_connection_id);
@@ -200,7 +201,7 @@ ScopedMessagePipeHandle ConnectToSlave(
 ScopedMessagePipeHandle ConnectToMaster(
     const std::string& platform_connection_id,
     const base::Closure& did_connect_to_master_callback,
-    RefPtr<PlatformTaskRunner>&& did_connect_to_master_runner,
+    RefPtr<TaskRunner>&& did_connect_to_master_runner,
     ChannelInfo** channel_info) {
   DCHECK(channel_info);
   DCHECK(internal::g_ipc_support);
@@ -248,7 +249,7 @@ ScopedMessagePipeHandle CreateChannelOnIOThread(
 ScopedMessagePipeHandle CreateChannel(
     ScopedPlatformHandle platform_handle,
     const base::Callback<void(ChannelInfo*)>& did_create_channel_callback,
-    RefPtr<PlatformTaskRunner>&& did_create_channel_runner) {
+    RefPtr<TaskRunner>&& did_create_channel_runner) {
   DCHECK(platform_handle.is_valid());
   DCHECK(!did_create_channel_callback.is_null());
   DCHECK(internal::g_ipc_support);
@@ -286,7 +287,7 @@ void DestroyChannelOnIOThread(ChannelInfo* channel_info) {
 // TODO(vtl): Write tests for this.
 void DestroyChannel(ChannelInfo* channel_info,
                     const base::Closure& did_destroy_channel_callback,
-                    RefPtr<PlatformTaskRunner>&& did_destroy_channel_runner) {
+                    RefPtr<TaskRunner>&& did_destroy_channel_runner) {
   DCHECK(channel_info);
   DCHECK(channel_info->channel_id);
   DCHECK(!did_destroy_channel_callback.is_null());